Carrier-phase synchronization can be approached in a general manner by estimating the multiplicative distortion (MD) to which a baseband received signal in an RF or coherent optical transmission system is subjected. This paper presents a unified modeling and estimation of the MD in finite-alphabet digital communication systems. A simple form of MD is the camer phase exp GO) which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for AMplitude as well as phase variations of the MD. We assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly-varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme.
标签： synchronization Carrier-phase multiplicativ approached
上传时间： 2013-11-28
上传用户：windwolf2000
In this letter, the error performance of an ultra-wideband (UWB) system with a hybrid pulse AMplitude and position modulation (PAPM) scheme over indoor lognormal fading channels is analyzed. In the PAPM UWB system, input data is modulated onto both the pulse AMplitudes and pulse positions.
标签： ultra-wideband performance amplitud letter
上传时间： 2014-01-08
上传用户：yulg
Using LabVIEW 8.5 Language to control Tektronix AWG3102. This program can select output waveform, frequency and AMplitude.
标签： Tektronix Language waveform LabVIEW
上传时间： 2016-05-17
上传用户：xlcky
Using LabVIEW to control Tektronix AWG2021 via GPIB. This program can select output waveform, frequency and AMplitude.
标签： Tektronix waveform LabVIEW control
上传时间： 2014-10-13
上传用户：66666
The following is a list of MATLAB codes which includes the radar absorbing material design, the antenna pattern, the observation points generation, and the AMplitude error and phase error calculations.
标签： following absorbing the includes
上传时间： 2014-01-04
上传用户：l254587896
计算全息close all clc clear A=zeros(64) A(15:20,20:40)=1 A(15:50,20:25)=1 A(45:50,20:40)=1 A(30:34,20:35)=1 ％ ppp=exp(rand(64)*pi*2*i) A=A.*ppp ％ Author s email: zjliu2001@163.com figure imshow(abs(A),[]) Fa=fft2(fftshift(A)) Fs=fftshift(Fa) Am=abs(Fs) ％ AMplitude Ph=angle(Fs) ％ phase s=11 ％ 这表示边长吗？ cgh=zeros(64*s) th=max(max(abs(Fs)))
上传时间： 2014-10-13
上传用户：wweqas
关于pcie switch(PLX PEX8632)的三个功能， 1.external eeprom读写 2.build-in loopback 3.改变AMplitude and DeEmphasis
上传时间： 2017-04-12
上传用户：hewenzhi
The Hilbert Transform is an important component in communication systems, e.g. for single sideband modulation/demodulation, AMplitude and phase detection, etc. It can be formulated as filtering operation which makes it possible to approximate the Hilbert Transform with a digital filter. Due to the non-causal and infinite impulse response of that filter, it is not that easy to get a good approximation with low hardware resource usage. Therefore, different filters with different complexities have been implemented. The detailed discussion can be found in "Digital Hilbert Transformers or FPGA-based Phase-Locked Loops" (http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4629940). The design is fully pipelined for maximum throughput.
标签： e.g. communication Transform important
上传时间： 2017-06-25
上传用户：gxf2016
16qam 随着现代通信技术的发展， 特别是移动通信技术高速发展， 频带利用率问题 越来越被人们关注。 在频谱资源非常有限的今天， 传统通信系统的容量已经不能 满足当前用户的要求。正交幅度调制 QAM(Quadrature AMplitude Modulation) 以其高频谱利用率、 高功率谱密度等优势， 成为宽带无线接入和无线视频通信的 重要技术方案。 随着现代通信技术的发展， 特别是移动通信技术高速发展， 频带利用率问题 越来越被人们关注。 在频谱资源非常有限的今天， 传统通信系统的容量已经不能 满足当前用户的要求。正交幅度调制 QAM(Quadrature AMplitude Modulation) 以其高频谱利用率、 高功率谱密度等优势， 成为宽带无线接入和无线视频通信的 重要技术方案。
上传时间： 2016-06-26
上传用户：guh000
Nature is seldom kind. One of the most appealing uses for radio- telephone systems—communication with people on the move—must over- come radio transmission problems so difficult they challenge the imagina- tion. A microwave radio signal transmitted between a fixed base station and a moving vehicle in a typical urban environment exhibits extreme variations in both AMplitude and apparent frequency.
标签： Communications Microwave Mobile
上传时间： 2020-05-28
上传用户：shancjb
